title: Combined technology for clomazone herbicide wastewater treatment: three-dimensional packed-bed electrochemical oxidation and biological contact degradation.
abstract: The clomazone herbicide wastewater was treated using a combined technology composed of electrochemical catalytic oxidation and biological contact degradation. A new type of electrochemical reactor was fabricated and a Ti/SnO2 electrode was chosen as the anode in electrochemical-oxidation reactor and stainless steel as the cathode. Ceramic rings loaded with SnO2 were used as three-dimensional electrodes forming a packed bed. The operation parameters that might influence the degradation of organic contaminants in the clomazone wastewater were optimized. When the cell voltage was set at 30 V and the volume of particle electrodes was designed as two-thirds of the volume of the total reactor bed, the chemical oxygen demand (COD) removal rate could reach 82% after 120 min electrolysis, and the ratio of biochemical oxygen demand (BOD)/COD of wastewater increased from 0.12 to 0.38. After 12 h degradation with biological contact oxidation, the total COD removal rate of the combined technology reached 95%, and effluent COD was below 120 mg/L. The results demonstrated that this electrocatalytic oxidation method can be used as a pretreatment for refractory organic wastewater before biological treatment.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China. yujief@hit.edu.cn
authors.forename: Yujie
authors.initials: Y
authors.lastname: Feng
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.forename: Limin
authors.initials: L
authors.lastname: Zhu
authors.forename: Jinzhi
authors.initials: J
authors.lastname: Wei
mesh_terms: D001673:Biodegradation, Environmental; D004563:Electrochemistry / Q000379:methods*; D006540:Herbicides / Q000737:chemistry / Q000378:metabolism; D007555:Isoxazoles / Q000737:chemistry* / Q000378:metabolism*; D023303:Oxazolidinones / Q000737:chemistry* / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism
chemical_list: D006540:Herbicides; D007555:Isoxazoles; D023303:Oxazolidinones; D014874:Water Pollutants, Chemical; C095255:clomazone